Rewterz Threat Alert – FormBook Malware – Active IOCs
October 15, 2021Rewterz Threat Alert – SNAKE Ransomware – Active IOCs
October 15, 2021Rewterz Threat Alert – FormBook Malware – Active IOCs
October 15, 2021Rewterz Threat Alert – SNAKE Ransomware – Active IOCs
October 15, 2021Severity
Medium
Analysis Summary
GuLoader is currently being distributed via spam email campaigns with archived attachments that contain the malware. The majority of malware downloaded by GuLoader is commodity malware, with AgentTesla, FormBook, and NanoCore being the most predominant. This downloader typically stores its encrypted payloads on Google Drive. It has also downloaded its payloads from Microsoft OneDrive and also from compromised or attacker-controlled websites. By utilizing legitimate file-sharing websites, GuLoader can evade network-based detection, as these services are not generally filtered or inspected in corporate environments. Usually, the downloaded payloads are encrypted with a hard-coded XOR key embedded in the malware, making it difficult for file-sharing service providers to identify the payload as malicious. This time, the GuLoader Shellcode injector is being distributed via a file named “EXTERNAL RFPPAN India Epoxy/PU 2021”. The scope of this campaign so far seems to be global.
Impact
- Information Theft
- Security Bypass
Indicators of Compromise
MD5
- 215e5cc2650d15c79ab17bd24e8458b9
- 025eaccfdecb9df000e526122ce84aa2
- e81f69cb288c16329f63c24bfbe984ae
SHA-256
- 773873a915db516ec70cc2ef28da691539af10d2aede89835f3f776f9c9afa04
- f16b2f7518ccea4c029f26bb8374e8f5f7be16ca76a68f8e449eba2bf02bf2b6
- 8e4dd31738a559924dc6c10223b4cc41d786102a1160cc96cf699d2a47c71b8d
SHA-1
- dd15ae65ca76966686fef3561a6213c92981eb45
- c620ab81722fcd626be856478ad5248136e2dc91
- a43afe1fff0ac7b2c73287654c61d498c8fb1c58
Remediation
- Search for IOCs in your environment.
- Block all the threat indicators in their respective controls.
- Do not download files attached in untrusted emails.
- Do not download files from untrusted sources on the internet.